include/net/tls.h

/* [<][>][^][v][top][bottom][index][help] */
This source file includes following definitions.
tls_record_is_start_marker
tls_record_start_seq
tls_is_partially_sent_record
tls_is_pending_open_record
is_tx_ready
tls_user_config
tls_is_sk_tx_device_offloaded
tls_err_abort
tls_bigint_increment
tls_get_ctx
tls_advance_record_sn
tls_fill_prepend
tls_make_aad
xor_iv_with_seq
tls_sw_ctx_rx
tls_sw_ctx_tx
tls_offload_ctx_tx
tls_sw_has_ctx_tx
tls_offload_ctx_rx
__tls_driver_ctx
tls_driver_ctx
tls_offload_rx_resync_request
tls_offload_rx_resync_set_type
tls_offload_tx_resync_request
tls_offload_tx_resync_pending
tls_device_init
tls_device_cleanup
tls_set_device_offload
tls_device_free_resources_tx
tls_set_device_offload_rx
tls_device_offload_cleanup_rx
tls_device_rx_resync_new_rec
tls_device_decrypted
   1 /*
   2  * Copyright (c) 2016-2017, Mellanox Technologies. All rights reserved.
   3  * Copyright (c) 2016-2017, Dave Watson <davejwatson@fb.com>. All rights reserved.
   4  *
   5  * This software is available to you under a choice of one of two
   6  * licenses.  You may choose to be licensed under the terms of the GNU
   7  * General Public License (GPL) Version 2, available from the file
   8  * COPYING in the main directory of this source tree, or the
   9  * OpenIB.org BSD license below:
  10  *
  11  *     Redistribution and use in source and binary forms, with or
  12  *     without modification, are permitted provided that the following
  13  *     conditions are met:
  14  *
  15  *      - Redistributions of source code must retain the above
  16  *        copyright notice, this list of conditions and the following
  17  *        disclaimer.
  18  *
  19  *      - Redistributions in binary form must reproduce the above
  20  *        copyright notice, this list of conditions and the following
  21  *        disclaimer in the documentation and/or other materials
  22  *        provided with the distribution.
  23  *
  24  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  25  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  26  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  27  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  28  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  29  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  30  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  31  * SOFTWARE.
  32  */
  33 
  34 #ifndef _TLS_OFFLOAD_H
  35 #define _TLS_OFFLOAD_H
  36 
  37 #include <linux/types.h>
  38 #include <asm/byteorder.h>
  39 #include <linux/crypto.h>
  40 #include <linux/socket.h>
  41 #include <linux/tcp.h>
  42 #include <linux/skmsg.h>
  43 #include <linux/mutex.h>
  44 #include <linux/netdevice.h>
  45 #include <linux/rcupdate.h>
  46 
  47 #include <net/tcp.h>
  48 #include <net/strparser.h>
  49 #include <crypto/aead.h>
  50 #include <uapi/linux/tls.h>
  51 
  52 
  53 /* Maximum data size carried in a TLS record */
  54 #define TLS_MAX_PAYLOAD_SIZE            ((size_t)1 << 14)
  55 
  56 #define TLS_HEADER_SIZE                 5
  57 #define TLS_NONCE_OFFSET                TLS_HEADER_SIZE
  58 
  59 #define TLS_CRYPTO_INFO_READY(info)     ((info)->cipher_type)
  60 
  61 #define TLS_RECORD_TYPE_DATA            0x17
  62 
  63 #define TLS_AAD_SPACE_SIZE              13
  64 #define TLS_DEVICE_NAME_MAX             32
  65 
  66 #define MAX_IV_SIZE                     16
  67 #define TLS_MAX_REC_SEQ_SIZE            8
  68 
  69 /* For AES-CCM, the full 16-bytes of IV is made of '4' fields of given sizes.
  70  *
  71  * IV[16] = b0[1] || implicit nonce[4] || explicit nonce[8] || length[3]
  72  *
  73  * The field 'length' is encoded in field 'b0' as '(length width - 1)'.
  74  * Hence b0 contains (3 - 1) = 2.
  75  */
  76 #define TLS_AES_CCM_IV_B0_BYTE          2
  77 
  78 /*
  79  * This structure defines the routines for Inline TLS driver.
  80  * The following routines are optional and filled with a
  81  * null pointer if not defined.
  82  *
  83  * @name: Its the name of registered Inline tls device
  84  * @dev_list: Inline tls device list
  85  * int (*feature)(struct tls_device *device);
  86  *     Called to return Inline TLS driver capability
  87  *
  88  * int (*hash)(struct tls_device *device, struct sock *sk);
  89  *     This function sets Inline driver for listen and program
  90  *     device specific functioanlity as required
  91  *
  92  * void (*unhash)(struct tls_device *device, struct sock *sk);
  93  *     This function cleans listen state set by Inline TLS driver
  94  *
  95  * void (*release)(struct kref *kref);
  96  *     Release the registered device and allocated resources
  97  * @kref: Number of reference to tls_device
  98  */
  99 struct tls_device {
 100         char name[TLS_DEVICE_NAME_MAX];
 101         struct list_head dev_list;
 102         int  (*feature)(struct tls_device *device);
 103         int  (*hash)(struct tls_device *device, struct sock *sk);
 104         void (*unhash)(struct tls_device *device, struct sock *sk);
 105         void (*release)(struct kref *kref);
 106         struct kref kref;
 107 };
 108 
 109 enum {
 110         TLS_BASE,
 111         TLS_SW,
 112         TLS_HW,
 113         TLS_HW_RECORD,
 114         TLS_NUM_CONFIG,
 115 };
 116 
 117 /* TLS records are maintained in 'struct tls_rec'. It stores the memory pages
 118  * allocated or mapped for each TLS record. After encryption, the records are
 119  * stores in a linked list.
 120  */
 121 struct tls_rec {
 122         struct list_head list;
 123         int tx_ready;
 124         int tx_flags;
 125 
 126         struct sk_msg msg_plaintext;
 127         struct sk_msg msg_encrypted;
 128 
 129         /* AAD | msg_plaintext.sg.data | sg_tag */
 130         struct scatterlist sg_aead_in[2];
 131         /* AAD | msg_encrypted.sg.data (data contains overhead for hdr & iv & tag) */
 132         struct scatterlist sg_aead_out[2];
 133 
 134         char content_type;
 135         struct scatterlist sg_content_type;
 136 
 137         char aad_space[TLS_AAD_SPACE_SIZE];
 138         u8 iv_data[MAX_IV_SIZE];
 139         struct aead_request aead_req;
 140         u8 aead_req_ctx[];
 141 };
 142 
 143 struct tls_msg {
 144         struct strp_msg rxm;
 145         u8 control;
 146 };
 147 
 148 struct tx_work {
 149         struct delayed_work work;
 150         struct sock *sk;
 151 };
 152 
 153 struct tls_sw_context_tx {
 154         struct crypto_aead *aead_send;
 155         struct crypto_wait async_wait;
 156         struct tx_work tx_work;
 157         struct tls_rec *open_rec;
 158         struct list_head tx_list;
 159         atomic_t encrypt_pending;
 160         /* protect crypto_wait with encrypt_pending */
 161         spinlock_t encrypt_compl_lock;
 162         int async_notify;
 163         int async_capable;
 164 
 165 #define BIT_TX_SCHEDULED        0
 166 #define BIT_TX_CLOSING          1
 167         unsigned long tx_bitmask;
 168 };
 169 
 170 struct tls_sw_context_rx {
 171         struct crypto_aead *aead_recv;
 172         struct crypto_wait async_wait;
 173         struct strparser strp;
 174         struct sk_buff_head rx_list;    /* list of decrypted 'data' records */
 175         void (*saved_data_ready)(struct sock *sk);
 176 
 177         struct sk_buff *recv_pkt;
 178         u8 control;
 179         int async_capable;
 180         bool decrypted;
 181         atomic_t decrypt_pending;
 182         /* protect crypto_wait with decrypt_pending*/
 183         spinlock_t decrypt_compl_lock;
 184         bool async_notify;
 185 };
 186 
 187 struct tls_record_info {
 188         struct list_head list;
 189         u32 end_seq;
 190         int len;
 191         int num_frags;
 192         skb_frag_t frags[MAX_SKB_FRAGS];
 193 };
 194 
 195 struct tls_offload_context_tx {
 196         struct crypto_aead *aead_send;
 197         spinlock_t lock;        /* protects records list */
 198         struct list_head records_list;
 199         struct tls_record_info *open_record;
 200         struct tls_record_info *retransmit_hint;
 201         u64 hint_record_sn;
 202         u64 unacked_record_sn;
 203 
 204         struct scatterlist sg_tx_data[MAX_SKB_FRAGS];
 205         void (*sk_destruct)(struct sock *sk);
 206         u8 driver_state[] __aligned(8);
 207         /* The TLS layer reserves room for driver specific state
 208          * Currently the belief is that there is not enough
 209          * driver specific state to justify another layer of indirection
 210          */
 211 #define TLS_DRIVER_STATE_SIZE_TX        16
 212 };
 213 
 214 #define TLS_OFFLOAD_CONTEXT_SIZE_TX                                            \
 215         (sizeof(struct tls_offload_context_tx) + TLS_DRIVER_STATE_SIZE_TX)
 216 
 217 enum tls_context_flags {
 218         TLS_RX_SYNC_RUNNING = 0,
 219         /* Unlike RX where resync is driven entirely by the core in TX only
 220          * the driver knows when things went out of sync, so we need the flag
 221          * to be atomic.
 222          */
 223         TLS_TX_SYNC_SCHED = 1,
 224 };
 225 
 226 struct cipher_context {
 227         char *iv;
 228         char *rec_seq;
 229 };
 230 
 231 union tls_crypto_context {
 232         struct tls_crypto_info info;
 233         union {
 234                 struct tls12_crypto_info_aes_gcm_128 aes_gcm_128;
 235                 struct tls12_crypto_info_aes_gcm_256 aes_gcm_256;
 236         };
 237 };
 238 
 239 struct tls_prot_info {
 240         u16 version;
 241         u16 cipher_type;
 242         u16 prepend_size;
 243         u16 tag_size;
 244         u16 overhead_size;
 245         u16 iv_size;
 246         u16 salt_size;
 247         u16 rec_seq_size;
 248         u16 aad_size;
 249         u16 tail_size;
 250 };
 251 
 252 struct tls_context {
 253         /* read-only cache line */
 254         struct tls_prot_info prot_info;
 255 
 256         u8 tx_conf:3;
 257         u8 rx_conf:3;
 258 
 259         int (*push_pending_record)(struct sock *sk, int flags);
 260         void (*sk_write_space)(struct sock *sk);
 261 
 262         void *priv_ctx_tx;
 263         void *priv_ctx_rx;
 264 
 265         struct net_device *netdev;
 266 
 267         /* rw cache line */
 268         struct cipher_context tx;
 269         struct cipher_context rx;
 270 
 271         struct scatterlist *partially_sent_record;
 272         u16 partially_sent_offset;
 273 
 274         bool in_tcp_sendpages;
 275         bool pending_open_record_frags;
 276 
 277         struct mutex tx_lock; /* protects partially_sent_* fields and
 278                                * per-type TX fields
 279                                */
 280         unsigned long flags;
 281 
 282         /* cache cold stuff */
 283         struct proto *sk_proto;
 284 
 285         void (*sk_destruct)(struct sock *sk);
 286 
 287         union tls_crypto_context crypto_send;
 288         union tls_crypto_context crypto_recv;
 289 
 290         struct list_head list;
 291         refcount_t refcount;
 292         struct rcu_head rcu;
 293 };
 294 
 295 enum tls_offload_ctx_dir {
 296         TLS_OFFLOAD_CTX_DIR_RX,
 297         TLS_OFFLOAD_CTX_DIR_TX,
 298 };
 299 
 300 struct tlsdev_ops {
 301         int (*tls_dev_add)(struct net_device *netdev, struct sock *sk,
 302                            enum tls_offload_ctx_dir direction,
 303                            struct tls_crypto_info *crypto_info,
 304                            u32 start_offload_tcp_sn);
 305         void (*tls_dev_del)(struct net_device *netdev,
 306                             struct tls_context *ctx,
 307                             enum tls_offload_ctx_dir direction);
 308         int (*tls_dev_resync)(struct net_device *netdev,
 309                               struct sock *sk, u32 seq, u8 *rcd_sn,
 310                               enum tls_offload_ctx_dir direction);
 311 };
 312 
 313 enum tls_offload_sync_type {
 314         TLS_OFFLOAD_SYNC_TYPE_DRIVER_REQ = 0,
 315         TLS_OFFLOAD_SYNC_TYPE_CORE_NEXT_HINT = 1,
 316 };
 317 
 318 #define TLS_DEVICE_RESYNC_NH_START_IVAL         2
 319 #define TLS_DEVICE_RESYNC_NH_MAX_IVAL           128
 320 
 321 struct tls_offload_context_rx {
 322         /* sw must be the first member of tls_offload_context_rx */
 323         struct tls_sw_context_rx sw;
 324         enum tls_offload_sync_type resync_type;
 325         /* this member is set regardless of resync_type, to avoid branches */
 326         u8 resync_nh_reset:1;
 327         /* CORE_NEXT_HINT-only member, but use the hole here */
 328         u8 resync_nh_do_now:1;
 329         union {
 330                 /* TLS_OFFLOAD_SYNC_TYPE_DRIVER_REQ */
 331                 struct {
 332                         atomic64_t resync_req;
 333                 };
 334                 /* TLS_OFFLOAD_SYNC_TYPE_CORE_NEXT_HINT */
 335                 struct {
 336                         u32 decrypted_failed;
 337                         u32 decrypted_tgt;
 338                 } resync_nh;
 339         };
 340         u8 driver_state[] __aligned(8);
 341         /* The TLS layer reserves room for driver specific state
 342          * Currently the belief is that there is not enough
 343          * driver specific state to justify another layer of indirection
 344          */
 345 #define TLS_DRIVER_STATE_SIZE_RX        8
 346 };
 347 
 348 #define TLS_OFFLOAD_CONTEXT_SIZE_RX                                     \
 349         (sizeof(struct tls_offload_context_rx) + TLS_DRIVER_STATE_SIZE_RX)
 350 
 351 void tls_ctx_free(struct sock *sk, struct tls_context *ctx);
 352 int wait_on_pending_writer(struct sock *sk, long *timeo);
 353 int tls_sk_query(struct sock *sk, int optname, char __user *optval,
 354                 int __user *optlen);
 355 int tls_sk_attach(struct sock *sk, int optname, char __user *optval,
 356                   unsigned int optlen);
 357 
 358 int tls_set_sw_offload(struct sock *sk, struct tls_context *ctx, int tx);
 359 void tls_sw_strparser_arm(struct sock *sk, struct tls_context *ctx);
 360 void tls_sw_strparser_done(struct tls_context *tls_ctx);
 361 int tls_sw_sendmsg(struct sock *sk, struct msghdr *msg, size_t size);
 362 int tls_sw_sendpage_locked(struct sock *sk, struct page *page,
 363                            int offset, size_t size, int flags);
 364 int tls_sw_sendpage(struct sock *sk, struct page *page,
 365                     int offset, size_t size, int flags);
 366 void tls_sw_cancel_work_tx(struct tls_context *tls_ctx);
 367 void tls_sw_release_resources_tx(struct sock *sk);
 368 void tls_sw_free_ctx_tx(struct tls_context *tls_ctx);
 369 void tls_sw_free_resources_rx(struct sock *sk);
 370 void tls_sw_release_resources_rx(struct sock *sk);
 371 void tls_sw_free_ctx_rx(struct tls_context *tls_ctx);
 372 int tls_sw_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
 373                    int nonblock, int flags, int *addr_len);
 374 bool tls_sw_stream_read(const struct sock *sk);
 375 ssize_t tls_sw_splice_read(struct socket *sock, loff_t *ppos,
 376                            struct pipe_inode_info *pipe,
 377                            size_t len, unsigned int flags);
 378 
 379 int tls_device_sendmsg(struct sock *sk, struct msghdr *msg, size_t size);
 380 int tls_device_sendpage(struct sock *sk, struct page *page,
 381                         int offset, size_t size, int flags);
 382 int tls_tx_records(struct sock *sk, int flags);
 383 
 384 struct tls_record_info *tls_get_record(struct tls_offload_context_tx *context,
 385                                        u32 seq, u64 *p_record_sn);
 386 
 387 static inline bool tls_record_is_start_marker(struct tls_record_info *rec)
 388 {
 389         return rec->len == 0;
 390 }
 391 
 392 static inline u32 tls_record_start_seq(struct tls_record_info *rec)
 393 {
 394         return rec->end_seq - rec->len;
 395 }
 396 
 397 int tls_push_sg(struct sock *sk, struct tls_context *ctx,
 398                 struct scatterlist *sg, u16 first_offset,
 399                 int flags);
 400 int tls_push_partial_record(struct sock *sk, struct tls_context *ctx,
 401                             int flags);
 402 void tls_free_partial_record(struct sock *sk, struct tls_context *ctx);
 403 
 404 static inline struct tls_msg *tls_msg(struct sk_buff *skb)
 405 {
 406         return (struct tls_msg *)strp_msg(skb);
 407 }
 408 
 409 static inline bool tls_is_partially_sent_record(struct tls_context *ctx)
 410 {
 411         return !!ctx->partially_sent_record;
 412 }
 413 
 414 static inline bool tls_is_pending_open_record(struct tls_context *tls_ctx)
 415 {
 416         return tls_ctx->pending_open_record_frags;
 417 }
 418 
 419 static inline bool is_tx_ready(struct tls_sw_context_tx *ctx)
 420 {
 421         struct tls_rec *rec;
 422 
 423         rec = list_first_entry(&ctx->tx_list, struct tls_rec, list);
 424         if (!rec)
 425                 return false;
 426 
 427         return READ_ONCE(rec->tx_ready);
 428 }
 429 
 430 static inline u16 tls_user_config(struct tls_context *ctx, bool tx)
 431 {
 432         u16 config = tx ? ctx->tx_conf : ctx->rx_conf;
 433 
 434         switch (config) {
 435         case TLS_BASE:
 436                 return TLS_CONF_BASE;
 437         case TLS_SW:
 438                 return TLS_CONF_SW;
 439         case TLS_HW:
 440                 return TLS_CONF_HW;
 441         case TLS_HW_RECORD:
 442                 return TLS_CONF_HW_RECORD;
 443         }
 444         return 0;
 445 }
 446 
 447 struct sk_buff *
 448 tls_validate_xmit_skb(struct sock *sk, struct net_device *dev,
 449                       struct sk_buff *skb);
 450 
 451 static inline bool tls_is_sk_tx_device_offloaded(struct sock *sk)
 452 {
 453 #ifdef CONFIG_SOCK_VALIDATE_XMIT
 454         return sk_fullsock(sk) &&
 455                (smp_load_acquire(&sk->sk_validate_xmit_skb) ==
 456                &tls_validate_xmit_skb);
 457 #else
 458         return false;
 459 #endif
 460 }
 461 
 462 static inline void tls_err_abort(struct sock *sk, int err)
 463 {
 464         sk->sk_err = err;
 465         sk->sk_error_report(sk);
 466 }
 467 
 468 static inline bool tls_bigint_increment(unsigned char *seq, int len)
 469 {
 470         int i;
 471 
 472         for (i = len - 1; i >= 0; i--) {
 473                 ++seq[i];
 474                 if (seq[i] != 0)
 475                         break;
 476         }
 477 
 478         return (i == -1);
 479 }
 480 
 481 static inline struct tls_context *tls_get_ctx(const struct sock *sk)
 482 {
 483         struct inet_connection_sock *icsk = inet_csk(sk);
 484 
 485         /* Use RCU on icsk_ulp_data only for sock diag code,
 486          * TLS data path doesn't need rcu_dereference().
 487          */
 488         return (__force void *)icsk->icsk_ulp_data;
 489 }
 490 
 491 static inline void tls_advance_record_sn(struct sock *sk,
 492                                          struct tls_prot_info *prot,
 493                                          struct cipher_context *ctx)
 494 {
 495         if (tls_bigint_increment(ctx->rec_seq, prot->rec_seq_size))
 496                 tls_err_abort(sk, EBADMSG);
 497 
 498         if (prot->version != TLS_1_3_VERSION)
 499                 tls_bigint_increment(ctx->iv + TLS_CIPHER_AES_GCM_128_SALT_SIZE,
 500                                      prot->iv_size);
 501 }
 502 
 503 static inline void tls_fill_prepend(struct tls_context *ctx,
 504                              char *buf,
 505                              size_t plaintext_len,
 506                              unsigned char record_type,
 507                              int version)
 508 {
 509         struct tls_prot_info *prot = &ctx->prot_info;
 510         size_t pkt_len, iv_size = prot->iv_size;
 511 
 512         pkt_len = plaintext_len + prot->tag_size;
 513         if (version != TLS_1_3_VERSION) {
 514                 pkt_len += iv_size;
 515 
 516                 memcpy(buf + TLS_NONCE_OFFSET,
 517                        ctx->tx.iv + TLS_CIPHER_AES_GCM_128_SALT_SIZE, iv_size);
 518         }
 519 
 520         /* we cover nonce explicit here as well, so buf should be of
 521          * size KTLS_DTLS_HEADER_SIZE + KTLS_DTLS_NONCE_EXPLICIT_SIZE
 522          */
 523         buf[0] = version == TLS_1_3_VERSION ?
 524                    TLS_RECORD_TYPE_DATA : record_type;
 525         /* Note that VERSION must be TLS_1_2 for both TLS1.2 and TLS1.3 */
 526         buf[1] = TLS_1_2_VERSION_MINOR;
 527         buf[2] = TLS_1_2_VERSION_MAJOR;
 528         /* we can use IV for nonce explicit according to spec */
 529         buf[3] = pkt_len >> 8;
 530         buf[4] = pkt_len & 0xFF;
 531 }
 532 
 533 static inline void tls_make_aad(char *buf,
 534                                 size_t size,
 535                                 char *record_sequence,
 536                                 int record_sequence_size,
 537                                 unsigned char record_type,
 538                                 int version)
 539 {
 540         if (version != TLS_1_3_VERSION) {
 541                 memcpy(buf, record_sequence, record_sequence_size);
 542                 buf += 8;
 543         } else {
 544                 size += TLS_CIPHER_AES_GCM_128_TAG_SIZE;
 545         }
 546 
 547         buf[0] = version == TLS_1_3_VERSION ?
 548                   TLS_RECORD_TYPE_DATA : record_type;
 549         buf[1] = TLS_1_2_VERSION_MAJOR;
 550         buf[2] = TLS_1_2_VERSION_MINOR;
 551         buf[3] = size >> 8;
 552         buf[4] = size & 0xFF;
 553 }
 554 
 555 static inline void xor_iv_with_seq(int version, char *iv, char *seq)
 556 {
 557         int i;
 558 
 559         if (version == TLS_1_3_VERSION) {
 560                 for (i = 0; i < 8; i++)
 561                         iv[i + 4] ^= seq[i];
 562         }
 563 }
 564 
 565 
 566 static inline struct tls_sw_context_rx *tls_sw_ctx_rx(
 567                 const struct tls_context *tls_ctx)
 568 {
 569         return (struct tls_sw_context_rx *)tls_ctx->priv_ctx_rx;
 570 }
 571 
 572 static inline struct tls_sw_context_tx *tls_sw_ctx_tx(
 573                 const struct tls_context *tls_ctx)
 574 {
 575         return (struct tls_sw_context_tx *)tls_ctx->priv_ctx_tx;
 576 }
 577 
 578 static inline struct tls_offload_context_tx *
 579 tls_offload_ctx_tx(const struct tls_context *tls_ctx)
 580 {
 581         return (struct tls_offload_context_tx *)tls_ctx->priv_ctx_tx;
 582 }
 583 
 584 static inline bool tls_sw_has_ctx_tx(const struct sock *sk)
 585 {
 586         struct tls_context *ctx = tls_get_ctx(sk);
 587 
 588         if (!ctx)
 589                 return false;
 590         return !!tls_sw_ctx_tx(ctx);
 591 }
 592 
 593 void tls_sw_write_space(struct sock *sk, struct tls_context *ctx);
 594 void tls_device_write_space(struct sock *sk, struct tls_context *ctx);
 595 
 596 static inline struct tls_offload_context_rx *
 597 tls_offload_ctx_rx(const struct tls_context *tls_ctx)
 598 {
 599         return (struct tls_offload_context_rx *)tls_ctx->priv_ctx_rx;
 600 }
 601 
 602 #if IS_ENABLED(CONFIG_TLS_DEVICE)
 603 static inline void *__tls_driver_ctx(struct tls_context *tls_ctx,
 604                                      enum tls_offload_ctx_dir direction)
 605 {
 606         if (direction == TLS_OFFLOAD_CTX_DIR_TX)
 607                 return tls_offload_ctx_tx(tls_ctx)->driver_state;
 608         else
 609                 return tls_offload_ctx_rx(tls_ctx)->driver_state;
 610 }
 611 
 612 static inline void *
 613 tls_driver_ctx(const struct sock *sk, enum tls_offload_ctx_dir direction)
 614 {
 615         return __tls_driver_ctx(tls_get_ctx(sk), direction);
 616 }
 617 #endif
 618 
 619 /* The TLS context is valid until sk_destruct is called */
 620 static inline void tls_offload_rx_resync_request(struct sock *sk, __be32 seq)
 621 {
 622         struct tls_context *tls_ctx = tls_get_ctx(sk);
 623         struct tls_offload_context_rx *rx_ctx = tls_offload_ctx_rx(tls_ctx);
 624 
 625         atomic64_set(&rx_ctx->resync_req, ((u64)ntohl(seq) << 32) | 1);
 626 }
 627 
 628 static inline void
 629 tls_offload_rx_resync_set_type(struct sock *sk, enum tls_offload_sync_type type)
 630 {
 631         struct tls_context *tls_ctx = tls_get_ctx(sk);
 632 
 633         tls_offload_ctx_rx(tls_ctx)->resync_type = type;
 634 }
 635 
 636 static inline void tls_offload_tx_resync_request(struct sock *sk)
 637 {
 638         struct tls_context *tls_ctx = tls_get_ctx(sk);
 639 
 640         WARN_ON(test_and_set_bit(TLS_TX_SYNC_SCHED, &tls_ctx->flags));
 641 }
 642 
 643 /* Driver's seq tracking has to be disabled until resync succeeded */
 644 static inline bool tls_offload_tx_resync_pending(struct sock *sk)
 645 {
 646         struct tls_context *tls_ctx = tls_get_ctx(sk);
 647         bool ret;
 648 
 649         ret = test_bit(TLS_TX_SYNC_SCHED, &tls_ctx->flags);
 650         smp_mb__after_atomic();
 651         return ret;
 652 }
 653 
 654 int tls_proccess_cmsg(struct sock *sk, struct msghdr *msg,
 655                       unsigned char *record_type);
 656 void tls_register_device(struct tls_device *device);
 657 void tls_unregister_device(struct tls_device *device);
 658 int decrypt_skb(struct sock *sk, struct sk_buff *skb,
 659                 struct scatterlist *sgout);
 660 struct sk_buff *tls_encrypt_skb(struct sk_buff *skb);
 661 
 662 struct sk_buff *tls_validate_xmit_skb(struct sock *sk,
 663                                       struct net_device *dev,
 664                                       struct sk_buff *skb);
 665 
 666 int tls_sw_fallback_init(struct sock *sk,
 667                          struct tls_offload_context_tx *offload_ctx,
 668                          struct tls_crypto_info *crypto_info);
 669 
 670 #ifdef CONFIG_TLS_DEVICE
 671 void tls_device_init(void);
 672 void tls_device_cleanup(void);
 673 int tls_set_device_offload(struct sock *sk, struct tls_context *ctx);
 674 void tls_device_free_resources_tx(struct sock *sk);
 675 int tls_set_device_offload_rx(struct sock *sk, struct tls_context *ctx);
 676 void tls_device_offload_cleanup_rx(struct sock *sk);
 677 void tls_device_rx_resync_new_rec(struct sock *sk, u32 rcd_len, u32 seq);
 678 int tls_device_decrypted(struct sock *sk, struct sk_buff *skb);
 679 #else
 680 static inline void tls_device_init(void) {}
 681 static inline void tls_device_cleanup(void) {}
 682 
 683 static inline int
 684 tls_set_device_offload(struct sock *sk, struct tls_context *ctx)
 685 {
 686         return -EOPNOTSUPP;
 687 }
 688 
 689 static inline void tls_device_free_resources_tx(struct sock *sk) {}
 690 
 691 static inline int
 692 tls_set_device_offload_rx(struct sock *sk, struct tls_context *ctx)
 693 {
 694         return -EOPNOTSUPP;
 695 }
 696 
 697 static inline void tls_device_offload_cleanup_rx(struct sock *sk) {}
 698 static inline void
 699 tls_device_rx_resync_new_rec(struct sock *sk, u32 rcd_len, u32 seq) {}
 700 
 701 static inline int tls_device_decrypted(struct sock *sk, struct sk_buff *skb)
 702 {
 703         return 0;
 704 }
 705 #endif
 706 #endif /* _TLS_OFFLOAD_H */
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root/include/net/tls.h

INCLUDED FROM

DEFINITIONS
